KR101802722B1 - Polarizing film production method - Google Patents
Polarizing film production method Download PDFInfo
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- KR101802722B1 KR101802722B1 KR1020177015294A KR20177015294A KR101802722B1 KR 101802722 B1 KR101802722 B1 KR 101802722B1 KR 1020177015294 A KR1020177015294 A KR 1020177015294A KR 20177015294 A KR20177015294 A KR 20177015294A KR 101802722 B1 KR101802722 B1 KR 101802722B1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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Abstract
The present invention relates to a method of producing a polarizing film for producing a polarizing film (23) from a polyvinyl alcohol based resin film (10), characterized in that the polyvinyl alcohol based resin film is contained in a treatment tank (13, 15, 17, 19) A transfer step of transferring the polyvinyl alcohol resin film immersed in the treatment liquid along a roll; and a transfer step of transferring the polyvinyl alcohol resin film immersed in the treatment liquid onto the rolls 32, 35, 38, 41, 51, 52, 53, 54 And a roll cleaning step of cleaning the surface of the polarizing film with a roll cleaning liquid.
Description
The present invention relates to a method for producing a polarizing film usable as a constituent member of a polarizing plate.
In the polarizing film, a uniaxially stretched polyvinyl alcohol resin film is conventionally used in which a dichroic dye such as iodine or a dichroic dye is adsorbed and oriented. The polarizing film is usually used for an image display apparatus represented by a liquid crystal display device such as a liquid crystal television, a personal computer monitor, and a cellular phone by bonding a protective film to one side or both sides thereof with an adhesive to form a polarizing plate.
In general, a polarizing film is a film obtained by sequentially dipping a continuous long polyvinyl alcohol-based resin film in a treating bath such as a swelling bath, a dyeing bath, or a crosslinking bath, (For example, Patent Document 1).
The polarizing film is a film obtained by continuously feeding a film from a raw (original) roll (wound product) of a polyvinyl alcohol-based resin film and transporting the polyvinyl alcohol-based resin layer in a transport path between the various treatment baths as described above By arranging the rolls, the polyvinyl alcohol-based resin layer is drawn after being immersed in one treatment bath and transported so as to be immersed in the next treatment bath to be continuously produced.
However, when a polarizing film produced by continuous manufacturing is observed, defects such as adhesion of dirt on the surface of the polarizing film may occur. As a result of studying the cause of such defects, it has been found that the treatment liquid in the treatment bath brought in by the polyvinyl alcohol-based resin film adheres to the surface of the roll placed in the transfer path between the treatment baths, And the surface of the roll was contaminated. The surface of the polyvinyl alcohol-based resin film was transported by the contaminated roll, so that the surface of the polyvinyl alcohol-based resin film was sometimes transferred with dirt. Particularly, since the treatment liquid in the dyeing bath or the crosslinking bath is adjusted by dissolving the salt, contamination of the surface of the roll caused by the treatment liquid in the treatment bath brought in by the polyvinyl alcohol based resin film can be prevented And it was easy to occur on the surface of rolls arranged to pull out the polyvinyl alcohol-based resin film. Further, since the polyvinyl alcohol-based resin film is hydrophilic and immediately after being drawn out from the treatment bath, the polyvinyl alcohol-based resin film is in a swollen state by the treatment liquid, deformation due to transfer of dirt on the roll surface and dirt on the roll surface is likely to occur. In addition, the surface of the roll was easily contaminated by the eluted components from the polyvinyl alcohol-based resin film.
Therefore, the present invention provides a method for producing a polarizing film in which contamination of the surface of a roll carrying a polyvinyl alcohol-based resin film disposed in a conveying path between various treatment baths is suppressed, and generation of surface defects such as dirt adhesion is suppressed .
The present invention provides a method for producing a polarizing film described below.
[1] A method for producing a polarizing film from a polyvinyl alcohol-based resin film,
An immersion step of immersing the polyvinyl alcohol-based resin film in a treatment liquid contained in a treatment tank,
A conveying step of conveying the polyvinyl alcohol resin film immersed in the treatment liquid along a roll;
And a roll cleaning step of cleaning the surface of the roll with a roll cleaning liquid.
[2] The process for producing a polarizing film according to the above [1], wherein in the roll cleaning step, the treatment liquid is used as the roll cleaning liquid.
[3] The production method of a polarizing film according to [2], wherein the roll cleaning liquid is recovered in the treatment tank after the roll cleaning step.
[4] The dipping step may be a dyeing treatment step in which the polyvinyl alcohol resin film is dyed with a dichroic dye, or a crosslinking treatment step in which the polyvinyl alcohol resin film is dipped in a crosslinking solution and crosslinked, The method for producing a polarizing film according to any one of [1] to [3].
[5] The polarizing film according to any one of [1] to [4], wherein the roll cleaning step includes a step of drawing the roll cleaning liquid onto the surface of the roll or a step of dipping the surface of the roll in the roll cleaning liquid ≪ / RTI >
According to the method of the present invention, it is possible to suppress the contamination of the surface of the rolls disposed in the transport path between the treatment baths during the continuous production of the polarizing film, and to produce a polarizing film in which surface defects such as dirt adhesion are suppressed have.
1 is a cross-sectional view schematically showing an example of a polarizing film producing method and a polarizing film producing apparatus used therefor according to a first embodiment of the present invention.
2 is a perspective view showing an example of the relationship between the nip roll and the shower shown in Fig.
3 is a cross-sectional view schematically showing an example of a polarizing film producing method and a polarizing film producing apparatus used therefor according to a second embodiment of the present invention.
4 is a graph showing the results of measurement of the boric acid content of the first crosslinking bath in Example 2 and Comparative Example 2. Fig.
5 is a graph showing the results of measurement of the boric acid content of the second crosslinking bath in Example 2 and Comparative Example 2. Fig.
≪ Polarizing Film Production Method >
In the polarizing film of the present invention, a dichroic dye (iodine or a dichroic dye) is adsorbed and oriented on a uniaxially stretched polyvinyl alcohol resin film. The polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin film is usually obtained by saponifying a polyvinyl acetate-based resin. The degree of saponification is usually about 85 mol% or more, preferably about 90 mol% or more, and more preferably about 99 mol% or more. The polyvinyl acetate resin may be, for example, a polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and other monomers copolymerizable therewith, and the like. Examples of other copolymerizable monomers include unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1000 to 10000, and preferably about 1500 to 5000.
These polyvinyl alcohol resins may be modified, and examples thereof include polyvinyl formal modified with aldehydes, polyvinyl acetal, polyvinyl butyral, and the like.
In the present invention, as a starting material for producing a polarizing film, an unstretched poly (meth) acrylate having a thickness of 65 占 퐉 or less (for example, 60 占 퐉 or less), preferably 50 占 퐉 or less, more preferably 35 占 퐉 or less, Vinyl alcohol resin film (original film) is used. As a result, a polarizing film of a thin film which is increasingly in demand in the market can be obtained. The original film may be a polyvinyl alcohol-based resin film subjected to stretching treatment in advance in the gas phase.
The width of the original film is not particularly limited and may be, for example, about 400 to 6000 mm. However, as the film width is larger, the film tends to be easily broken during the stretching treatment.
In the present invention, the original film is prepared as a roll (disk roll) of a long unoriented polyvinyl alcohol based resin film.
The polarizing film can be continuously produced as a long polarizing film by continuously carrying the above-mentioned long original film along the film conveying path of the polarizing film producing apparatus while performing the predetermined treatment process while being unwound from the original roll. The predetermined processing step includes an immersion step of immersing the original film in a processing solution (hereinafter also referred to as a " processing bath ") accommodated in the processing vessel, and a transporting step of transporting the original film drawn out from the processing bath along the roll. The immersion process and the transfer process are repeatedly performed on different treatment baths to produce a polarizing film.
In the present invention, in addition to the immersion process and the transport process for producing the polarizing film from the polyvinyl alcohol-based resin film, a roll cleaning process for cleaning the roll for transporting the original film drawn from the treatment bath is provided. It is preferable that such a roll cleaning step is performed simultaneously with the continuous production of the polarizing film. By having the roll cleaning step, the present invention can prevent contamination of the surface of a roll that carries the original film, and prevent defects such as dirt adhering to the surface of the polarizing film due to such contamination.
As the roll cleaning liquid, in addition to pure water, the same treatment liquid as that contained in the immediately preceding treatment tank can be used, but a treatment liquid is preferably used. Even when the polyvinyl alcohol based resin film to be conveyed is in direct contact with the roll cleaning liquid or when the conveyed polyvinyl alcohol based resin film is in contact with the roll cleaning liquid adhered to the roll surface, It is possible to prevent defects from being caused in the polyvinyl alcohol-based resin film. When the treatment liquid is used as the roll cleaning liquid, it is preferable that the treatment liquid is recovered in the immediately preceding treatment tank after the roll cleaning process. When the treatment liquid is not used as the roll cleaning liquid, the concentration of the treatment liquid on the polyvinyl alcohol-based resin film changes when the roll cleaning liquid comes in contact with the polyvinyl alcohol-based resin film, and defects such as stains may occur. Therefore, when the treatment liquid is not used as the roll cleaning liquid, it is preferable to supply the roll cleaning liquid to the roll surface so that the roll cleaning liquid does not directly contact the polyvinyl alcohol resin film. It is also preferable that the roll cleaning liquid adhered to the surface of the roll is recovered so as not to come into contact with the polyvinyl alcohol-based resin film with a scraper or the like.
Specifically, the immersion step includes a swelling treatment step in which the original film is immersed in a swelling solution (hereinafter also referred to as " swelling bath ") contained in the swelling bath, and a film drawn out from the swelling bath in the subsequent conveying step (Hereinafter also referred to as a " crosslinking bath ") accommodated in a crosslinking tank is immersed in a dyeing solution which is dipped in a dyeing solution A film washing step of immersing the film drawn out from the crosslinking bath by a crosslinking treatment step in which it is immersed in a film washing tank (hereinafter also referred to as " film cleansing bath ") accommodated in a film washing tank, and the like. The uniaxial stretching treatment is carried out either wet or dry in a series of the immersion process and the transfer process (that is, before and / or after any one or more of the immersion processes). If necessary, other processing steps may be added. Each of the above-described immersion processes may be a process of immersing the film in one bath or a process of sequentially immersing the film in two or more baths.
Hereinafter, a method of manufacturing a polarizing film according to the present invention will be described in more detail with reference to Figs. 1 to 3. Fig.
[First Embodiment]
1 is a cross-sectional view schematically showing an example of a polarizing film producing method and a polarizing film producing apparatus used therefor according to a first embodiment of the present invention. The polarizing film producing apparatus shown in Fig. 1 is configured such that an original (non-stretchable)
On the other hand, FIG. 1 shows an example in which a
The film transport path of the polarizing film producing apparatus includes, in addition to the above treatment bath, guide rolls 30 to 41, 60 and 61 capable of supporting the transported film or changing the film transport direction, The nip rolls 50 to 55 can be constructed by sandwiching the nip rolls 50 to 55 so that the driving force by the rotation can be given to the film or the film transport direction can be changed. The guide rolls and nip rolls can be disposed before or after each treatment bath and the treatment bath, whereby the introduction and immersion of the film in the treatment bath and the withdrawal from the treatment bath can be performed (see Fig. 1). For example, by providing at least one guide roll in each treatment bath and transporting the film along these guide rolls, the film can be immersed in each treatment bath.
In the polarizing film producing apparatus shown in Fig. 1, nip rolls are arranged before and after each treatment bath (nip rolls 50 to 54), whereby in the at least one treatment bath, It is possible to carry out roll-to-roll stretching in which longitudinally uniaxial stretching is carried out with a main speed difference between the rolls.
The polarizing film producing apparatus shown in Fig. 1 is provided with
(Swelling treatment step)
The swelling process is performed for the purpose of removing foreign substances on the surface of the
1, the swelling process is a process in which the
Examples of the swelling liquid of the swelling
The temperature of the swelling
In the swelling process, there is a problem that the
In the swelling process, since the film swells and expands even in the transport direction of the film, in order not to elongate the film in the transport direction when the film is not actively stretched, for example, It is preferable to take measures such as controlling the speed of the
In the example shown in Fig. 1, the film drawn out from the swelling
(Dyeing process)
The dyeing treatment step is carried out for the purpose of adsorbing and orienting the dichroic dye to the swollen polyvinyl alcohol resin film. The processing conditions are determined within a range in which the object can be achieved and within a range in which the problems such as extreme melting or disintegration of the film do not occur. 1, the dyeing process is carried out along the film transport path established by the guide rolls 33 to 35 and the
When iodine is used as the dichroic dye, an aqueous solution having an iodine / potassium iodide / water concentration of about 0.003 to 0.3 / about 0.1 to 10/100 in terms of the concentration by weight can be used for the dyeing bath of the
When a water-soluble dichroic dye is used as the dichroic dye, an aqueous solution having a dichroic dye / water concentration of about 0.001 to 0.1 / 100 in terms of the concentration by weight, for example, can be used for the dyeing solution of the
In the dyeing treatment step as described above, uniaxial stretching of the film can be performed in the
In the dyeing process, as in the swelling process, the guide rolls 33, 34 and / or 35 are provided with widening functions such as an expander roll, a spiral roll, and a crown roll in order to transport the polyvinyl alcohol- Or other widening devices such as cross guiders, bend bars, tenter clips or the like. Another means for suppressing the occurrence of wrinkles is to perform a stretching treatment in the same manner as in the swelling treatment.
In the example shown in Fig. 1, the film drawn out from the
(Cross-linking treatment step)
The crosslinking treatment is a treatment for the purpose of, for example, water resistance by crosslinking and color adjustment (preventing the film from becoming blue). 1, the cross-linking treatment is carried out along the film conveyance path constructed by the guide rolls 36 to 38 and the
The crosslinking solution of the
In the crosslinking treatment, the concentration of boric acid and iodide and the temperature of the
In the crosslinking treatment for the purpose of color adjustment, for example, when iodine is used as the dichroic dye, a solution containing a crosslinking agent having a concentration of boric acid / iodide / water = 1 to 5/3 to 30/100 can be used . The temperature of the crosslinking bath at the time of immersing the film is usually about 10 to 45 占 폚, and the immersion time of the film is usually about 1 to 300 seconds, preferably 2 to 100 seconds.
The cross-linking treatment may be performed a plurality of times, usually 2 to 5 times. In this case, the composition and temperature of each crosslinking bath to be used may be the same or different depending on the above-mentioned range. The crosslinking treatment for water resistance by crosslinking and the crosslinking treatment for color adjustment may each be performed in a plurality of steps.
It is also possible to perform uniaxial stretching processing in the
In the cross-linking treatment, the guide rolls 36, 37 and / or 38 are provided with widening functions such as an expander roll, a spiral roll, and a crown roll in order to transport the polyvinyl alcohol-based resin film while removing the wrinkles of the film, Or other widening devices such as cross guiders, bend bars, tenter clips or the like. Another means for suppressing the occurrence of wrinkles is to perform a stretching treatment in the same manner as in the swelling treatment.
In the example shown in Fig. 1, the film drawn out from the
(Film washing process step)
The production method of the present invention may include a film washing treatment process after the crosslinking treatment process. The film cleaning treatment is performed for the purpose of removing excess boric acid or iodine adhered to the polyvinyl alcohol-based resin film. The film washing treatment can be carried out, for example, by immersing a crosslinked polyvinyl alcohol resin film in a
Fig. 1 shows an example in which a polyvinyl alcohol-based resin film is immersed in a
On the other hand, also in the film cleaning process, the guide rolls 39, 40 and / or 41 are provided with widening functions such as expander rolls, spiral rolls, and crown rolls for the purpose of transporting the polyvinyl alcohol- Rolls, or other widening devices such as cross guiders, bend bars, tenter clips or the like. Further, in the film washing treatment, a stretching treatment may be performed to suppress the occurrence of wrinkles.
(Stretching process step)
As described above, the
The final cumulative stretch magnification of the
The stretching treatment step may be carried out in any treatment step, and in the case of performing the stretching treatment in two or more treatment steps, the stretching treatment may be performed in any treatment step. According to the present invention, even when the uniaxial stretching process is performed at any stage after the swelling process (including the swelling process), the film breakage during the stretching process can be effectively suppressed.
(Drying Treatment Step)
After the washing treatment step, the polyvinyl alcohol based resin film is desirably dried. The drying of the film is not particularly limited, but can be carried out using the drying
(Other Treatment Processes for Polyvinyl Alcohol-based Resin Film)
Processing other than the above-described processing may be added. Examples of treatments that can be added include an immersion treatment (complementary color treatment) in an iodide aqueous solution containing no boric acid, which is carried out after the crosslinking treatment step, an immersion treatment in an aqueous solution containing no zinc chloride Immersion treatment (zinc treatment).
(Roll cleaning step)
The roll cleaning step is a cleaning step of cleaning each roll disposed in the conveying path between the two treatment baths with the roll cleaning liquid during the above-described continuous production of producing the polarizing film from the polyvinyl alcohol based resin film. The method of cleaning the rolls is not particularly limited. However, it is also possible to use a method in which the surfaces of the rolls (the guide rolls 32, 35, 38, 41 and the nip rolls 51, 52, 53, 54) A method in which the roll cleaning liquid is led to the surface of each roll by the
The cleaning of each roll with the roll cleaning liquid is preferably carried out during the continuous production of the polarizing film, and is preferably carried out at all times during the continuous production. Even if the polyvinyl alcohol-based
1, for all the rolls (guide rolls 32, 35, 38, 41 and nip
2 is a perspective view showing an example of the relationship between the rolls on the upper side of the nip rolls 51, 52, 53, 54 and the
As the roll cleaning liquid used in the
As the roll cleaning liquid used for the shower 73 (74) for cleaning the
As the roll cleaning liquid used for the shower rolls 75 and 76 for cleaning the guide rolls 38 and the nip rolls 53 disposed behind the
As the roll cleaning liquid used for the
As described above, as the roll cleaning liquid, a treatment liquid used in a treatment tank immediately before a roll to be cleaned is suitable. In addition, it is preferable that the roll cleaning liquid supplied to the roll cleaning includes means for recovering the roll cleaning liquid in the processing tank used as the processing liquid. Further, from the viewpoint of prevention of foreign matter contamination, the roll cleaning liquid provided for the roll cleaning may be subjected to a filtration treatment and recovered in the treatment tank.
As a result of producing a polarizing film by the polarizing film producing apparatus shown in Fig. 1, defects such as adhesion of dirt were not observed on its surface.
1 shows a shower as a member for drawing a roll cleaning liquid on the surface of the roll, but it is not limited to a shower if the roll cleaning liquid can be led to the surface of the roll. The shower is a member for ejecting the cleaning liquid in a linear shape, and in addition to the shower, there is a member for ejecting the cleaning liquid in liquid or mist form, a member for dropping or flowing down the roll cleaning liquid by gravity, And the like. Further, the roll cleaning itself may have a structure in which the roll cleaning liquid exudes from the inside thereof, whereby the roll cleaning process may be performed by leading the roll cleaning liquid from the inside to the roll surface. As a member for applying the roll cleaning liquid to the surface of the roll, there is exemplified a brush having a structure in which the roll cleaning liquid exudes, and the surface of the roll to be cleaned is cleaned with a roll cleaning liquid. On the other hand, the roll cleaning step may include a step of immersing the surface of the roll to be cleaned in the roll cleaning liquid, instead of the step of drawing the roll cleaning liquid onto the surface of the roll to be cleaned. Specifically, a method may be used in which a liquid pool of a roll cleaning liquid is provided in a rotation path of a roll to be cleaned, and the entire surface of the roll is cleaned through the liquid pool every one revolution. Also in this method, as the roll cleaning liquid, it is preferable that the roll cleaning liquid after the roll cleaning is recovered in the immediately preceding treatment tank by using the treatment liquid used in the immediately preceding treatment tank.
[Second Embodiment]
3 is a cross-sectional view schematically showing an example of a polarizing film producing method and a polarizing film producing apparatus used therefor according to a second embodiment of the present invention. The polarizing film producing apparatus shown in Fig. 3 is a device in which a disc (unstretched)
The polarizing film producing apparatus shown in Fig. 3 includes guide rolls 130 to 148, 60 and 61 which can support the film to be conveyed or change the film conveying direction in addition to the treatment bath, By placing the nip rolls 50, 51, 52, 53a, 53b, 54, 55 capable of imparting driving force to the film by pivoting, or changing the film transport direction, can do. The guide roll or nip roll can be placed before or after each treatment bath and in the treatment bath, whereby the introduction and immersion of the film in the treatment bath and the withdrawal from the treatment bath can be performed (see Fig. 3).
In the polarizing film producing apparatus shown in Fig. 3, nip rolls are arranged before and after each treatment bath (nip rolls 50, 51, 52, 53a, 53b, 54, 55). This makes it possible to perform roll-to-roll stretching in which longitudinal uniaxial stretching is carried out with a major difference in speed between nip rolls arranged before and after one or more treatment baths.
In the polarizing film producing apparatus shown in Fig. 3, in order to face the nip rolls 51, 52, 53a, 53b, 54 disposed behind the
Details of the swelling treatment step, the dyeing treatment step, the crosslinking treatment step, the film washing treatment step, the stretching treatment step, the drying treatment step and other treatment steps for the polyvinyl alcohol based resin film are the same as those described in the first embodiment same. In the second embodiment, the
(Roll cleaning step)
During the above-described continuous production in which a polarizing film is produced from a polyvinyl alcohol-based resin film, the roll cleaning process is performed by rotating each of the nip rolls 51, 52, 53a, 53b, and 54 disposed on the conveying path between the two treatment baths And a cleaning step of cleaning the substrate with a cleaning liquid. By the shower (171a, 171b, 172a, 172b, 173a, 173b, 174a, 174b, 175a, 175b) arranged to face the surface of each nip roll (51, 52, 53a, 53b, 54) The roll cleaning liquid is led out to the surface, and the surface of each nip roll is cleaned.
The cleaning of each roll with the roll cleaning liquid is preferably carried out during the continuous production of the polarizing film, and is preferably carried out at all times during the continuous production. Even if the polyvinyl alcohol-based
3, all the nip rolls 51, 52, 53a, 53b, and 54 disposed after each treatment tank are provided with shower (171a, 171b, 172a, 172b, 173a, 173b, 174a, 174b, 175a, and 175b are provided. However, they may be disposed only on the surface of the roll that is susceptible to contamination, and may be disposed to face the surface of at least one roll. The nip rolls 53 after the
As the roll cleaning liquid used in the
As the roll cleaning liquids used in the
As the roll cleaning liquid used in the
As the roll cleaning liquid used in the
As the roll cleaning liquids used in the
As described above, even when the processing liquid in the processing tank is taken out and adhered to the roll by the polyvinyl alcohol-based resin film being conveyed, it is recovered in the processing tank by the cleaning step of the roll, , And even when a polarizing film is continuously produced, a polarizing film having uniform properties can be produced.
On the other hand, from the viewpoint of prevention of foreign matter contamination, the roll cleaning liquid provided for the roll cleaning may be subjected to filtration treatment and then recovered in the treatment tank.
As a result of producing a polarizing film by the polarizing film producing apparatus shown in Fig. 3, no defects such as adhesion of dirt were observed on its surface. Also, even if the polarizing film was continuously produced, the polarizing film having uniform characteristics could be continuously produced without greatly changing the composition of each processing bath.
<Polarizer>
A polarizing plate can be obtained by bonding a protective film to at least one side of a polarizing film produced as described above through an adhesive. As the protective film, for example, a film comprising an acetylcellulose-based resin such as triacetylcellulose or diacetylcellulose; A film made of a polyester resin such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; Polycarbonate resin film, cycloolefin resin film; Acrylic resin film; And a film made of a chain olefin resin of a polypropylene type resin.
The surface of the polarizing film and / or the protective film may be subjected to surface treatment such as a corona treatment, a flame treatment, a plasma treatment, an ultraviolet ray irradiation, a primer coating treatment or a saponification treatment in order to improve the adhesion between the polarizing film and the protective film good. Examples of the adhesive used for bonding the polarizing film and the protective film include an active energy ray curable adhesive such as an ultraviolet ray curable adhesive or an aqueous solution of a polyvinyl alcohol resin or an aqueous solution containing a crosslinking agent and an aqueous adhesive such as a urethane emulsion adhesive . The ultraviolet curable adhesive may be a mixture of an acrylic compound and a photo radical polymerization initiator, a mixture of an epoxy compound and a cationic photopolymerization initiator, and the like. In addition, a cationic polymerizable epoxy compound and a radical polymerizable acrylic compound may be used in combination, and a photocationic polymerization initiator and a photo radical polymerization initiator may be used together as an initiator.
Example
Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
≪ Example 1 >
The two crosslinking baths 17 (hereinafter, the first crosslinking bath is referred to as a
(Kurarupo pig film VF-PE # 3000, trade name, manufactured by Kuraray Co., Ltd., average degree of polymerization of 2400, degree of saponification of 99.9 mol% or more) was withdrawn from the roll at a thickness of 30 占 퐉 on a long polyvinyl alcohol , And immersed in a swelling
During the continuous production of the polarizing film, the
No precipitation of salts or the like occurred on the surface of each roll even if the polarizing film was continuously manufactured for 7 hours by cleaning the guide roll and nip roll drawn out from each treatment bath. In addition, defects as a cause of contamination on the roll surface did not occur in the polarizing film.
≪ Example 2 >
A polarizing film was produced using the same apparatus as the polarizing film producing apparatus shown in Fig. All of the guide rolls 130 to 148 were flat rolls. 3, no shower for cleaning the guide rolls 132, 136, 140, 144, 148 is shown. In this embodiment, however, the cleanliness of these guide rolls, the cleaning of the nip roll .
(Trade name: Kurarupo Pfal Film VF-PE # 3000, manufactured by Kuraray Co., Ltd.), an average degree of polymerization of 2400, a degree of saponification of 99.9 mol% or more, a thickness of 30 m and a width of 450 mm Was continuously conveyed at 16 m / hour while being unwound from the roll, and immersed in a swelling
During the continuous production of the polarizing film, the
Precipitation of salts or the like occurs on the surface of each roll even if the polarizing film is manufactured while the nip rolls 51, 52, 53a, 53b, and 54 disposed behind each treatment bath are cleaned to produce a polarizing film continuously for 7 hours Did not do it. In addition, defects as a cause of contamination on the roll surface did not occur in the polarizing film.
≪ Comparative Example 1 &
A polarizing film of Comparative Example 1 was produced in the same manner as in Example 1 except that the guide roll drawn out from each treatment bath and the nip roll were not cleaned.
In the case where the guide roll and the nip roll drawn out from each treatment bath were not cleaned, after the polarizing film was continuously produced for one hour, contamination on each roll was confirmed. In particular, much contamination was observed on the
≪ Comparative Example 2 &
A polarizing film of Comparative Example 2 was produced in the same manner as in Example 2 except that the nip rolls 51, 52, 53a, 53b and 54 disposed after each treatment bath were not cleaned. In Comparative Example 2, after the polarizing film was continuously produced for one hour, contamination on the nip rolls 51, 52, 53a, 53b and 54 was confirmed. In particular, much contamination was observed in the
<Measurement of Composition of Boric Acid Concentration in Crosslinking Bath>
After the production of the polarizing film and the boric acid content of the
Boron content (parts by weight) = (6.18 x drop of sodium hydroxide aqueous solution (ml) / (weight of cross-linking solution (g) -6.18 x drop of sodium hydroxide aqueous solution (ml)))
Lt; / RTI > Table 1 shows the results of measurement of the boric acid content of the
4 and 5 are graphs showing the results shown in Tables 1 and 2, respectively. It can be seen from Tables 1 and 2 that the difference between the maximum value and the minimum value of the boric acid content in the
10: original film made of polyvinyl alcohol-based resin
11: disk roll 13: swelling bath
15: dye bath 17: bridging bath
19: Three lusts 21: Dried by
23: polarizing film
30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 60,
50, 51, 52, 53, 54, 55: nip roll
174a, 174b, 175a, 175b: a shower, a shower, a shower, a shower,
Claims (5)
An immersion step of immersing the polyvinyl alcohol-based resin film in a treatment liquid contained in a treatment tank,
A conveying step of conveying the polyvinyl alcohol resin film immersed in the treatment liquid along a roll;
And a roll cleaning step of cleaning the surface of the roll with a roll cleaning liquid,
The processing liquid in the processing tank in the immersion step immediately before the roll cleaning step is led out to the surface of the roll as the roll cleaning liquid to perform the roll cleaning step, and after the roll cleaning step, Wherein the film is recovered in the treatment tank in the immersion step immediately before the roll cleaning step.
Immersion means for immersing the polyvinyl alcohol-based resin film in a treatment liquid contained in the treatment tank,
Conveying means for conveying the polyvinyl alcohol-based resin film immersed in the treatment liquid along the roll;
And roll cleaning means for cleaning the surface of the roll with a roll cleaning liquid,
The treatment liquid in the treatment tank in the immersion means immediately before the roll cleaning means is led out to the surface of the roll as the roll cleaning liquid to clean the surface of the roll, And the film is recovered in the treatment tank in the immersion means immediately before the roll cleaning means after being used for cleaning.
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CN (1) | CN107003467B (en) |
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JP7177590B2 (en) * | 2017-12-07 | 2022-11-24 | 日東電工株式会社 | Polarizing film manufacturing method and polarizing film manufacturing apparatus |
JP7292130B2 (en) * | 2019-06-28 | 2023-06-16 | 日東電工株式会社 | Polarizer manufacturing method and polarizer manufacturing apparatus |
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